1. Go to Classes
  2. Click on the name of the perspective yogi
  3. Delete the yogi from the class
  4. Select This class and all following

The yogi is now deleted from this class and all following unpaid classes. The yogi purchases a new class pass or you assign one to the yogi and repeat the process by adding the yogi to the series of classes. 

Please note: It is not possible for yogis to cancel classes that are an unpaid reservation. After these classes are set as booked, they are able to cancel.